Re: [PATCH v8 03/15] x86: Secure Launch Kconfig

Ard Biesheuvel
2024-02-15T07:59:42Z

On Wed, 14 Feb 2024 at 23:31, Ross Philipson <ross.philipson@oracle.com> wrote:
>
> Initial bits to bring in Secure Launch functionality. Add Kconfig
> options for compiling in/out the Secure Launch code.
>
> Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
> ---
> arch/x86/Kconfig | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 5edec175b9bf..d96d75f6f1a9 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2071,6 +2071,18 @@ config EFI_RUNTIME_MAP
>
> See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map.
>
> +config SECURE_LAUNCH
> + bool "Secure Launch support"
> + default n

'n' is already the default, so you can drop this line.

> + depends on X86_64 && X86_X2APIC

This depends on CONFIG_TCG_TPM as well (I got build failures without it)

> + help
> + The Secure Launch feature allows a kernel to be loaded
> + directly through an Intel TXT measured launch. Intel TXT
> + establishes a Dynamic Root of Trust for Measurement (DRTM)
> + where the CPU measures the kernel image. This feature then
> + continues the measurement chain over kernel configuration
> + information and init images.
> +
> source "kernel/Kconfig.hz"
>
> config ARCH_SUPPORTS_KEXEC
> --
> 2.39.3
>